package com.caidan.security.config;

import com.caidan.security.domain.LoginUser;
import com.caidan.security.utils.JwtUtil;
import com.caidan.security.utils.RedisCache;
import io.jsonwebtoken.Claims;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request,
                                    HttpServletResponse response, FilterChain filterChain) throws ServletException,
            IOException, ServletException {
//获取token
        String token = request.getHeader("token");
        if (!StringUtils.hasText(token)) {
//放行
            filterChain.doFilter(request, response);
            return;
        }
//解析token
        String userid;
        try {
            Claims claims = JwtUtil.parseJWT(token);
            userid = claims.getSubject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("token非法");
        }
//从redis中获取用户信息
        String redisKey = "login:" + userid;
        LoginUser loginUser = redisCache.getCacheObject(redisKey);
        if (Objects.isNull(loginUser)) {
            throw new RuntimeException("用户未登录");
        }
//存入SecurityContextHolder
//TODO 获取权限信息封装到Authentication中
        UsernamePasswordAuthenticationToken authenticationToken =
                new UsernamePasswordAuthenticationToken(loginUser, null, null);
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
//放行
        filterChain.doFilter(request, response);
    }
}